RE: Re: RE: Re: Mavilor Servos, how to test + Identify

> Thanks Jon for the quick reply.
> Did some further examination
> Nameplate says DC servo motor, amazing what one can find out when i open my eyes!!!

Ahh, that helps.

JH Took off the nameplate and here are the best guesses that we could make ( got the better half to assist as my eyes are suffering from 2 decades of long days and nights on CAD)
Ncm = 22? or 27?
V 7? could be a 0, 5 6, or 8
RPM 3000
KW 0.2 or 0.7
Amps unable to read anything

Unfortunately, there are lots of variations. Are the brushes all the same, and in
the same plane?
JH Just 4 at one end on same plane, with opposite ones connected together

Many servo motors have temperature sensing devices (thermocouples, thermistors
even thermostats) inside to warn the machine control of overheating. Some really
oddball servos have windings that either boost or buck the permanent magnet
field.
JH Unable to find any thermal protection device

Check the Green/Yellow wire to see if it is a case ground.
JH yes it is

Check the resistance on the brown and blue wires, maybe that will indicate
something. Inspect the interior of the motor with a flashlight and see if there is
a cooling fan.
JH no specific cooling fan, but the motor construction is " disc armature"printed" motor" with 8 poles.

Put a voltmeter on the brown and blue wires and turn the motor.
If you get a voltage, it may be a tach winding.
JH yes got up to 8VDC peak on fastest hand turn i could achieve


JH a friend gave me a loan of Compumotor, Step Motor and Servo Motor Systems and Controls, it contains some excellent application solutions and design guidelines, recommend it to beginners like myself.


John H







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